Interlocking safety switches
SKI
Protection class IP 65
q
The slim design and dimensions of the SKI
(according to EN 50047) allow it to be
mounted onto narrow profile systems and
in confined spaces. Operation can be per-
formed both horizontally and vertically. This
flexible form of mounting is supported by
Mechanical data
l Enclosure and lid made from glass-fibre
reinforced PA 6 (UL 94-V0)
l Switching device made from PA/St and
stainless steel
l Actuator made from stainless steel
Positioning the actuator head
l Rotation in 4 x 90° increments: when
mounted, the head is fixed into position
by the clasp
l Horizontal or vertical operation
the ability to position the actuating head in l Cable entry M 20 x 1.5
4 x 90° increments.
(optional: M 16 x 1.5)
The SKI has the option of two new built-in
operating functions.
Mounting and installation
l Integrated forced ejection function (FE):
The actuator is ejected from the switch:
– preventing unauthorized use of a spare
actuator to defeat the safety function
– ensuring the guard must be closed
securely to enable the machine to run
l Integrated actuator holding force
(FI 50 = 50 N):
Guard doors which may open due to
vibration can be held shut by using the
SKI with increased actuator holding
force of 50 N, without the need for
bulky external latches. In addition several
doors mounted in a straight line on one
machine are kept closed.
l The safety switch is mounted using 2 x
M5 screws in the locating and mounting
holes.
l The separate actuator is mounted using
2 x M4 screws. The safety switch and
the actuator should be secured well, in
order to prevent unintentional loosening
(one-way and break-off screws, rivets
etc.).
21.5
(0.85")
The SKI is equipped with positive-break
and galvanically-isolated contacts.
Available are:
Warning
l 1 NC p/1 NO slow-action device
l 1 NC p/1 NO snap-action device
l The safety switch must not be used
as a mechanical end stop.
l 2 NC p
slow-action device
l To preserve the level of safety, the safety
switch must only be used in conjunction
with the correct actuator.
l 2 NC p/1 NO slow-action device
Contact configuration
Switching element
Function
Contacts
Designation
Voltage
Continuous current
Slow-action
Snap-action
Slow-action
Slow-action
changeover
1 NC/1 NO
1 NC/1 NO
2 NC
U1Z
250 V
250 V
250 V
400 V
10 A
10 A
10 A
6 A
changeover
SU1Z
A2Z
normally-closed
changeover, overlapping 2 NC/1 NO
UV15Z
66